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Administrator<br />

To use the same text to add another methyl group:<br />

1. Point to the atom you want to replace, in this<br />

example a hydrogen, and click.<br />

The text box appears with the previous label.<br />

2. Press the Enter key.<br />

To add a different element:<br />

1. Click a hydrogen atom.<br />

A text box appears over the atom.<br />

2. Type N.<br />

3. Press the Enter key.<br />

A nitrogen is added to form ethylamine.<br />

To build ethylamine in one step:<br />

1. Click in the model window.<br />

A text box appears.<br />

2. Type CH3CH2NH.<br />

3. Press the Enter key.<br />

A model of ethylamine appears.<br />

Changing atom types<br />

You can use a text box to change the atom type and<br />

bonding characteristics.<br />

To change the atom type of some atoms:<br />

1. Click a carbon atom.<br />

A text box appears.<br />

2. Shift+click the other carbon atom.<br />

Both atoms are selected.<br />

3. Type C Alkene.<br />

4. Press the Enter key.<br />

The atom type and the bond order are changed<br />

to reflect the new model of ethyleneamine.<br />

You can point at the atoms and bonds to<br />

display this new information.<br />

The Table Editor<br />

To use the Table Editor to enter text in a text box:<br />

1. From the View menu, point to Parameter<br />

Tables, and choose Atom Types.<br />

2. Select the element or atom type in the table.<br />

3. From the Edit menu, choose Copy.<br />

4. Double-click in the Chem3D Model Window.<br />

5. In Chem3D, from the Edit menu, choose Paste.<br />

The copied text appears in the text box.<br />

Specifying Order of Attachment<br />

In both the simple and complex forms for using the<br />

Text tool, you can specify the order of attachment<br />

and repeating units by numbers and parentheses.<br />

For example:<br />

• Type (CH3)3CNH2 into a text box with no<br />

atoms selected and press the Enter key.<br />

A model of tert-butylamine appears.<br />

Using Substructures<br />

You can use pre-defined functional groups called<br />

substructures to build models. Some advantages for<br />

using substructures in your model building process<br />

are as follows:<br />

• Substructures are energy minimized.<br />

• Substructures have more than one attachment<br />

atom (bonding atom) pre-configured.<br />

For example, the substructure Ph for the<br />

phenyl group has a single attachment point.<br />

The substructure COO for the carboxyl group<br />

has attachment points at both the Carboxyl<br />

carbon and the Alcohol Oxygen. These<br />

provide for insertion of this group within a<br />

model. Similar multi-bonding sites are defined<br />

for all amino acid and other polymer units.<br />

56 •Building and Editing Models <strong>CambridgeSoft</strong><br />

Building With The Text Tool

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